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Sixty degrees is used because it is the angle at which the distance required for floc settling is minimized and still allows the solids that settled on the side of the tube to slide down. The critical velocity is taken from a range of accepted values and has been found to be the critical velocity in previous plants in Honduras. The flow rate was calculated using the following equations.
Schematic of the Data Collecting Settling Tubes
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Dimensions and Variables chosen:
- b = diameter = 2.5 cm
- L = length of the tube settler = 60 cm
- alpha = optimum angle = 60°
Unable to find DVI conversion log file.
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